Dual-emission rare earth organic coordination polymer PAAC-Eu and application thereof in fluorescence ratio and paper-based rapid detection of EDTA (Ethylene Diamine Tetraacetic Acid)

The invention provides a dual-emission rare earth organic coordination polymer PAAC-Eu, and in the dual-emission rare earth organic coordination polymer PAAC-Eu, the ratio of coumarin fluorophore to a repetitive unit (-CH (COOH) CH2-) of polyacrylic acid is 1: (3-5). The water dispersion performance is good, the blue light and red light dual-emission performance is good, the probe is used for achieving fluorescence ratio detection of EDTA, and the problem that single-wavelength fluorescence detection is prone to being affected by probe concentration, environmental factors and the like can be solved. The invention also provides a preparation method of the dual-emission rare earth organic coordination polymer PAAC-Eu, and the preparation method is simple. The handheld sensing platform based on the smart phone app and the paper-based sensor is rapid, convenient, real-time, in-situ, economical and practical, use of large instruments is avoided, and EDTA rapid visual detection can be carried out in the field or in